Machine for assembling metallized resistors

ABSTRACT

AN AUTOMATIC MACHINE IS PROVIDED FOR ASSEMBLY METALLIZED RESISTORS BY PRESSING CAPS WITH CENTRAL WIRE LEADS ONTO METALLIZED CERAMIC BASES OF RESISTORS BY MEANS OF PRESSING PUNCHES WHICH ARE MOVABLE TOWARDS ONE ANOTHER IN A ROTARY DRUM. THE PUNCHES MOVE TOWARDS EACH OTHER IN AXIAL OPENINGS IN THE DRUM AND THE DRUM HAS AN ANNULAR STEPPED GROOVE BETWEEN THE PUNCHES. THE PUNCHES HAVE SOCKETS WITH RADIAL CUTS FOR SUPPLY OF THE CAPS AND THE CUTS FORM A COMMON TANGENTIAL SURFACE WITH THE CYLINDRICAL SURFACE OF ONE OF THE STEPS OF THE ANNULAR GROOVE. A CULINDRICAL SURFACE OF A PROTRUSION IN THE GROOVE IS PROVIDED WITH RECESSES FOR RECEIVING THE CERAMIC BASES OF THE RESISTORS IN COAXIAL ARRANGEMENT WITH THE SOCKETS IN THE PUNCHES. THE SOCKETS IN THE PUNCHES HAVE A NARROWED MIDDLE PORTION FOR ACCOMMODATION OF THE LEAD TO INSURE CENTERING OF THE CAP IN THE SOCKET THROUGH THE LEAD.

Jan. 5, 1971 3,551,985

MA-CHINE FOR ASSEMBLING METALLIZED RESISTORS Filed Jan. 11, 1968 P. lvANov EI'AL 2 Sheets-Sheet 1 Jan. 5, 1971 p, N V EIAL 3,551,985

MACHINE FOR ASSEMBLING METALLIZED RESISTORS Filed Jan. 11, 1968 v 2 Sheets-Sheet 2 United States Patent 3,551,985 MACHINE FOR ASSEMBLING METALLIZED RESISTORS Ivan Petrovich Ivanov, Alexandr Vasilievich Bespalov,

and Pavel Pavlovich Ananiev, Leningrad, U.S.S.R., assignors to Leningradskoe Proizvodstvennoe Obiedineuie Radiodetal, Leningrad, U.S.S.R.

Filed Jan. 11, 1968, Ser. No. 697,174 Int. Cl. Hk 13/00 US. Cl. 29-203 7 Claims ABSTRACT OF THE DISCLOSURE An automatic machine is provided for assembly metallized resistors by pressing caps with central wire leads onto metallized ceramic bases of resistors by means of pressing punches .which are movable towards one another in a rotary drum. The punches move towards each other in axial openings in the drum and the drum has an annular stepped groove between the punches. The punches have sockets with radial cuts for supply of the caps and the cuts form a common tangential surface with the cylindrical surface of one of the steps of the annular groove. A cylindrical surface of a protrusion in the groove is provided with recesses for receiving the ceramic bases of the resistors in coaxial arrangement with the sockets in the punches. The sockets in the punches have a narrowed middle portion for accommodation of the lead to insure centering of the cap in the socket through the lead.

The present invention relates to a machine for assembling metallized resistors and is intended to be used in the radioelectronic industry for producing metallized resistors.

Known in the art are machines for assembling metallized resistors, in which contact caps with leads are pressed onto workpieces by means of punches which move towards each other through the intermediary of a cam or template.

The punches move towards each other in openings provided in two separate drums, and the coaxial arrangement of said openings requires a special complicated apparatus. Sockets for caps in the punches are not concentric, and therefore upon wear of the guide keys and grooves, the alignment of the sockets becomes disturbed, which results in improper operation of the entire machine and the quantity and quality of assembled resistors is poor.

It is an object of the present invention to provide a machine for assembling metallized resistors, which will be simple in manufacture, stable in operation and capable of insuring a high quality of assembled resistors.

In accordance with the above and other objects in the machine for assembling metallized resistors, the movement of punches towards each other is effected in one drum, which is provided with through openings spaced peripherally along its axis to accommodate said punches, and with annular slots in the middle portion thereof which forms a stepped annular groove. According to the invention, the punches are provided with concentrically arranged sockets and with radical cuts coinciding with the generatrix of the cylindrical surface of one of the steps of said groove, said radial cuts serving to open said sockets for receiving caps with leads therein. Disposed on the cylindrical surface of another step of said stepped annular groove is an annular projection with recesses for workpieces arranged coaxially with said sockets.

Below the drum at the outlet for produced resistors with caps pressed onto the ends thereof are two parallel guides for receiving quality acceptable resistors to be directed therealong, and an inclined chute arranged below 3,551,985 Patented Jan. 5, 1971 said guides to remove faulty resistors with caps pressed only on one side thereof.

In the punches, the sockets for caps with leads may be made with a narrowed middle portion to accommodate the lead serving as a pilot pin to center the cap.

It is preferred that a push-out pin be disposed under the drum for ejecting completed resistors therefrom. The cams lwhich impart axial motion to the punches are adjustably mounted.

The machine proposed herein provides for a high efliciency of assembling metallized resistors, and precise and dependable pressing of caps with wire axial leads onto workpieces. This is attained due to the provision of through openings in one drum and concentrically arranged sockets for the caps in the punches having a narrowed middle portion to accommodate the pilot pin centering the cap thereinside.

Other objects and advantages of the present invention will become more fully apparent upon a consideration of a specific exemplary embodiment thereof described hereinbelow with due reference to the accompanying drawings, wherein:

FIG. 1 is an elevation view, partly in section which schematically shows the machine according to the invention;

FIG. 2 is an elevation view of a workpiece feed device with a push-out pin in the machine according to the invention;

FIG. 3 shows the drum of the machine of the present invention, in section;

FIG. 4 is a section taken along line IVIV of FIG. 3;

FIG. 5 is a part sectional view of a punch of the machine according to the invention; and

FIG. 6 is a section taken along line VIVI of FIG. 5.

Now referring to FIG. 1, the machine for assembling metallized resistors comprises a rotary drum 1 (FIG. 1), vibrating feed bins 2 and 3 for contact caps with leads and a feed bin 4 for workpieces of metallized resistors.

The drum 1 is provided with through openings 5 (FIG. 3) arranged circumferentially along the axis thereof. In the middle portion of the drum 1 annular slots are provided, which form a stepped annular groove 6. Accommodated in the openings 5 of the drum 1 (FIG. 1) are punches 7 that move towards each other from templets 8 adjustably mounted on the end faces of the drum 1.

The drum 1 is fixed on a shaft 9 which is rotated through a clutch 10 and a reducing gear 11 by an electric motor 12.

The punches 7 are provided with concentrically arranged sockets 13 (FIG. 6) and with radial cuts 14 coinciding with the generatrix of the cylindrical surface of one of the steps of the groove 6, i.e. forming a common tangential surface therewith said radial cuts serving to open the sockets 13. The sockets 13 are fed with contact caps delivered along channels 15 from vibrating feed bins 2 and 3 (FIG. 1). On the cylindrical surface of another step of the groove 6 (FIG. 3) an annular projection 16 is disposed with recesses 17 arranged coaxially with the sockets 13 of the punches 7 (FIG. 1) and intended to accommodate workpieces that are fed from the bin 4 along a channel 18. To make the punches 7 move towards each other, each of said punches is provided with a roller 19, which, as the drum 1 rotates, rolls over the adjustably mounted templets 8.

The adjustable mounting of the templates 8 is effected by means of damping gaskets 20 on adjustable supports 21. The adjustable supports 21 make it possible to bring the templates 8 closer together or further apart depending on the length of the workpieces. The damping gaskets 20 'make for the allowance value of the workpieces during the movement of the punches 7.

ice

For elfecting an oriented piecewise feeding of workpieces from the bin 4, the bottom of said bin is driven in rotation by an electric motor 22. In the bottom portion of the channel 18 a distributor 23 is located, disposed between the punches 7 so that workpieces from the distributor 23 are fed piecewise into the recesses 17 of the annular projection 16 as the drum 1 rotates.

A pusher 24 (FIG. 2) enters the distributor 23, said pusher urging the workpieces delivered into the distributor 23 into the recesses 17.

To preclude the possibility of jamming the contact caps in the channels 15 during their movement therealong, said channels 15 are imparted with vibration from the vibrating feed bins 2 and 3.

Disposed below the drum 1 are a push-out pin 25 operatively connected with the pusher 24 and two inclined parallel guides 26 (FIG. 1) for directing resistors with caps pressed thereon into a receptacle 27 for ready articles. Disposed under the guides 26 is an inclined chute 28 for removing faulty resistors, e.g. those with caps pressed only on one side thereof.

The sockets 13 (FIG. for caps with leads in the punches 7 are made with a narrowed middle portion 29 to accommodate the leads which center the cap.

The machine is provided with blocking arrangements 30 (FIG. 1) and 31 (FIG. 2) which stop the rotation of the drum 1 in case the feeding of contact caps and workpieces is discontinued.

The machine of the invention operates as follows. Contact caps with leads are loaded into the vibrating feed bins 2 and 3 (FIG. 1), wherefrom via the vibrating channels 15 they are delivered piecewise into the sockets 13 of the punches 7, while workpieces are loaded into the bin 4 with the rotating bottom, wherefrom, via the channel 18, they are fed into the distributor 23. From the distributor 23 the workpieces are delivered piecewise into the recesses 17 of the annular projection 16 of the drum 1.

The electric motor 12 is started, and the rotation through the reducing gear 11, clutch and shaft 9 is transmitted to the drum 1. In the course of rotation of the drum 1, the sockets 13 and recesses 17 are fed piecewise with contact caps from the channels and with workpieces from the distributor 23, respectively. The rollers 19 of the punches 7 roll over the templets 8 and move the punches 7 towards each other, thereby effecting the pressing of the contact caps onto a workpiece. The drum 1 rotating further, the punches 7 are moved apart under the action of a spring 32, and other punches with sockets are brought under the channels 15.

The assembled resistors drop onto the guides 26. The resistors with contact caps properly pressed thereon move along the guides 26 into the receptacle 27. Resistors with contact caps pressed only on one side thereof drop between the guides 26 and arrive in the inclined chute 28 which moves them aside.

If an assembled resistor fails to drop from the recess 17 of the drum 1, such resistor is pushed by the push-out pin 25 (FIG. 2) fixed on the lever of the pusher 24 which operates from a roller 33 of a templet 34 which is fixed on the drum 1.

The blocking arrangement 30 (FIG. 1) stops the device by breaking the electric circuit in such cases, when the pile of contact caps in the channels 15 happens to be of such a height as not to reach the contact of said blocking arrangement.

If the feed of workpieces into the recesses 17 of the drum 1 is discontinued, the blocking arrangement 31 (FIG. 2) operates and stops the device.

What is claimed is:

1. A machine for assembling metallized resistors comprising a rotary drum having an axis of rotation and a plurality of axial openings extending therethrough, said openings being arranged around said axis peripherally in the drum, said drum having two spaced central annular slots defining a stepped annular groove in the center of the drum with an intermediate annular protrusion, said annular protrusion having a plurality of recesses therein forreceiving blanks, means for supplying blanks to the recesses in the protrusion, punches in said openings on opposite sides of said groove, said punches being displaceable in said openings for movement towards and away from one another, said drum having opposite ends, means including templates supported adjacent the ends of the drums for engaging said punches to displace the same in the openings, said punches having concentric sockets therein for receiving caps with leads therein, said sockets having radial cuts therein for supply of the caps with leads into the sockets, said radial cuts forming a common tangential surface with the cylindrical surface, of one of the steps of said annular groove in the drum, means for supplying caps with leads to the sockets in the punches, said sockets of said punches being coaxial with the recesses of said protrusion to enable the punches to apply the caps onto opposite ends of the blanks in the recesses as the drum rotates.

2. A machine as claimed in claim 1 comprising inclined. parallel guides below the drum for receiving assembled resistors therefrom to deliver said resistors to a receiver station, and an inclined chute adjacent said guide for receiving blanks with only one cap pressed thereon for delivery to a separate station.

3. A machine as claimed in claim 1 wherein said sockets have a narrow central portion for accommodating the leads of a cap to center such cap.

4. .A machine as claimed in claim 1 comprising a displaceable push-out pin disposed beneath the drum for ejecting assembled resistors from the recesses.

5. A machine as claimed in claim 1 wherein said means to displace the punches includes adjustable support means for said templets.

6. A machine as claimed in claim 1 wherein said means for supplying blanks comprises a feed bin and a distributor for supplying blanks one by one to the recesses in the annular protrusion.

7. A machine as claimed in claim 1 wherein said means for supplying caps with leads to the sockets in the punches comprises a vibrating feed bin and a chute with vibrating guides leading from the bin to the sockets.

References Cited UNITED STATES PATENTS 3,029,500 4/1962 Aronson et al. 29211 3,268,992 8/1966 IanuzZi et al. 29203 THOMAS H. EAGER, Primary Examiner US. Cl. X.R. 292l1 

